@Carlie *********
, IF you have a year long multi-entry Non-ED visa you need to know that it is only good for a 90 day entry stamp.
SO
you either need to leave/re-enter thailand to get another 90 day entry (which you can do every 90 days for the whole year) <-although with the covid shit show and mandatory quarantine you aren't gonna bounce out and back in easy :O
OR
you need to get documentation from where ever it is you're studying and go apply for an extension BEFORE the current entry stamp you have now expires and you go on overstay.
At this time you don't do any 90 day reporting because the visa you're on doesn't let you stay IN thailand long enough to be required to file one UNTIL you extend it when they'll put a paper in your passport telling you when your first 90 day report is due